I believe the answer is A because commas shouldn't come after the world and in answer B and D. Answer C has no commas and therefore cannot be the correct answer.
Answer:
A. Bubbles formed
Explanation:
When a student added a piece of limestone to a solution of hydrochloric acid, bubbles are formed.
The bubbles are as a result of the CO2 gas that is formed.
Below is the reaction:
CaCO3+2HCl → CO2+H2O + Ca++ + 2Cl-
From the left hand side, we can see that the reaction is with limestone and hydrochloric acid. Their reaction forms carbon dioxide gas (CO2), water (H2O), dissolved calcium (Ca++) and dissolved chlorine (Cl-) on the right hand side.
With due observation, bubbles will be seen evolving from the reaction. These bubbles formed is the carbon dioxide gas which reveals that a reaction is taking place.
Answer:
The <u>180th meridian </u>or <u>antimeridian</u>
Explanation:
- 180 east and west are the same.
- It forms a great circle dividing the earth into the Western and Eastern Hemispheres.
The connotation of dialect is a form on language that is used by a specific region or group of people.
Hope this helps : )
